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Larvae Information Summary for
Trisopterus luscus
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 3 | |||
| Preanal L. % TL | 49 | 48.1 | 48.6 |
| Place of development | planktonic | |||
| Larval area | to be filled | |||
| Yolk-sac | ovoid unpigmented | Ref: | ||
| Yolk | unsegmented | Oil globules | no oil globule | |
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| The last third of the postanal portion of the body is free from pigment. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | ||
| Striking feature | none | |||
| Shape of gut | triangular | |||
| Gas bladder early | invisible | late | invisible | |
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | tail partly covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Peritoneum | covered with melanophores | |||
| Pectorals | normal without melanophores | |||
| Pelvics | normal (i.e. small or absent) | |||
| The abrupt ending of the body pigmentation about half way between the anus and the end of the tail is characteristic. At a length of 4.5 mm there are slight traces of epural and hypural interspinous rays in the caudal fin. | ||||
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | 3.8 | 64 | Jan | Feb | Mar | Apr |
| min | 3.1 | 37 | May | Jun | Jul | Aug |
| mod | 3.3 | 41 | Sep | Oct | Nov | Dec |
| Water parameters Metric characters |
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